Credit Line and Notes - Silicon Valley Bank Credit Facility (Details)		12 Months Ended
	Mar. 28, 2014 USD ($)	Jun. 30, 2018 USD ($)	Jul. 01, 2017 USD ($)	Jul. 02, 2016 USD ($)	Sep. 17, 2015 USD ($)	Sep. 16, 2015 USD ($)
Line of Credit Facility [Line Items]
Interest expense paid		$ 24,000	$ 13,313,000	$ 3,936,000
Silicon Valley Bank
Line of Credit Facility [Line Items]
Default interest rate (percent)	2.00%
Silicon Valley Bank | LIBOR | Senior Secured Credit Facility
Line of Credit Facility [Line Items]
Increase or decrease in interest rate margins	2.25%
Silicon Valley Bank | Wall Street Journal Prime Rate | Senior Secured Credit Facility
Line of Credit Facility [Line Items]
Increase or decrease in interest rate margins	1.00%
Silicon Valley Bank | Oclaro Technology Limited
Line of Credit Facility [Line Items]
Minimum net cash required under loan agreement	$ 15,000,000
Increase in interest rate under loan agreement	0.75%
Silicon Valley Bank | Oclaro Technology Limited | Minimum
Line of Credit Facility [Line Items]
Interest expense paid	$ 45,000
Silicon Valley Bank | Oclaro Technology Limited | Loan Agreement
Line of Credit Facility [Line Items]
Percentage of eligible accounts for advances	80.00%
Minimum fixed charge coverage ratio	1.10
Silicon Valley Bank | Oclaro Technology Limited | Loan Agreement | Revolving Credit Facility
Line of Credit Facility [Line Items]
Term of debt	3 years
Facility size	$ 40,000,000
Equipment liens that may qualify as Permitted Liens					$ 15,000,000.0	$ 5,000,000.0
Amounts outstanding under credit agreement		$ 0
Silicon Valley Bank | Oclaro Technology Limited | Loan Agreement | Letters of Credit, Foreign Exchange Contracts and Cash Management Services
Line of Credit Facility [Line Items]
Facility size	$ 10,000,000